| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Önder Kalacı <onderkalaci(at)gmail(dot)com>, japin <japinli(at)hotmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, David Steele <david(at)pgmasters(dot)net>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: row filtering for logical replication |
| Date: | 2021-09-24 08:39:25 |
| Message-ID: | CAA4eK1K9p0hCVO4SBCRJU=zEQbvTy0AtWjdhx7-ehMiBWT_14w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Sep 24, 2021 at 12:19 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Fri, Sep 24, 2021 at 12:04 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > One possibility in this regard could be that we enhance Replica
> > Identity .. Include (column_list) where all the columns in the include
> > list won't be sent
>
> Instead of RI's include column list why we can not think of
> row_filter's columns list? I mean like we log the old RI column can't
> we make similar things for the row filter columns? With that, we
> don't have to all the columns instead we only log the columns which
> are in row filter, or is this too hard to identify during write
> operation?
>
Yeah, we can do that as well but my guess is that will have some
additional work (to find common columns and log them only once) in
heap_delete/update and then probably during decoding (to assemble the
required filter and RI key). I am not very sure on this point, one has
to write code and test.
--
With Regards,
Amit Kapila.
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